My bf is not inviting me

So my bf and i are long distance and his frat has a date party. My bf mentioned it to me but i brushed it off because i didnt think i would be free that weekend. Well i am and i have been hinting that we should do something that weekend. He has ignored me and honestly don't think he wants me there at all. Its just that i would want to go cause i am free and it would be fun for us. I don't mind if he takes another girl its just that i can go but i don't think he wants me there. Its a big drinking thing and thats not me so i guess he maybe wants to have fun without me and be with his friends but shouldnt he say that to me?? What would you do?